-LRB- CNN -RRB- Here 's a look at the Westminster Kennel Club Dog Show , the second oldest continuous sporting event in the United States , after the Kentucky Derby .

The 139th Annual Westminster Kennel Club Dog Show took place February 16-17 , 2015 . David Merriam judged Best in Show on Tuesday evening .

Facts : The show is `` benched , '' meaning the dogs must be on public display to ticket holders throughout the competition .

Dogs are invited to compete based on strict entry requirements , including how many other dogs they 've defeated in breed competitions . Non-invited dogs can also compete if they have won a certain number of major dog show awards .

Breeds are categorized into groups : Sporting , Hound , Working , Terrier , Toy , Non-Sporting and Herding .

The dogs compete for Best in Breed , then move up to Best in Group , then compete for the grand prize of Best in Show .

192 dog breeds and varieties are eligible to enter .

2,711 dogs entered the 2015 Show .

Terriers have won the most Best in Show awards -- 46 as of 2015 .

Forty-seven breed varieties have won Best in Show awards , as of 2015 .

Seven dogs have won more than one Best in Show . The most recent was an English springer spaniel named Chinoe 's Adamant James , who won in 1971 and 1972 .

Timeline :1870 s - The Westminster Kennel Club is started by a group of men who frequently meet at the Westminster Hotel in New York and are interested in dogs .

1876 - The Westminster Kennel Club decides to put on an annual dog show to improve breeds of dogs and to raise public interest .

May 8-10 , 1877 - The WKC presents the `` First Annual New York Bench Show of Dogs . '' The show is held at Gilmore 's Gardens at Madison Avenue and 26th Street in New York City . The show is so popular with the public , it is extended an extra day .

1888 - The date of the show is moved from May to February .

1907 - The show presents its first Best in Show award , to a smooth fox terrier named Ch . Warren Remedy . He also wins in 1908 and 1909 .

1921 - The show changes from four days to three days .

1923 - Best in Show is not awarded while the American Kennel Club works to put standards and regulations in place to ensure uniformity .

1941 - The show becomes a two-day event .

1984 - The biggest dog to win Best in Show is Seward 's Blackbeard , a 155-pound Newfoundland .

1988 - The smallest dog to win Best in Show is Great Elms Prince Charming II , a 4.5-pound Pomeranian .

2009 - Best in Show is a Sussex spaniel , `` Ch Clussexx Three D Grinchy Glee , '' a.k.a. `` Stump . '' At 10 , he is the oldest winner in show history .

2013 - `` GCH Banana Joe V Tani Kazari , '' aka `` Banana Joe '' or Joey , becomes the first affenpinscher to win Best in Show . `` Bugaboo 's Picture Perfect , '' aka Swagger , an English sheepdog , is named Reserve Best in Show , a runner-up award reintroduced for the 2013 show after not having been awarded since 1925 .

2014 - `` Sky , '' a female wire fox terrier , wins Best in Show . This is the 14th time that a wire fox terrier has won Best in Show , more than any other breed .

2015 - Miss P , a 15-inch beagle , wins Best in Show . Her full name is `` Ch Tashtins Looking for Trouble . '' Miss P defeats six other group winners , including the Portuguese water dog , Matisse , the cousin of President Barack Obama 's dog , Sunny , and Rocket , a shih-tzu co-owned by newspaper heiress Patty Hearst .

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The Westminster Dog Show debuted in 1877

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Terriers have won the most Best in Show awards